The flagship particle accelerator at the European Organisation for Nuclear Research (Cern) is to be restarted in October as opposed to September.

The Large Hadron Collider (LHC) has been offline since an incident on 19 September last year, when an equipment failure caused extensive damage. James Gillies, Cern's head of communications, said on Monday that an internal schedule set in February to restart the experiment has been pushed back by two or three weeks, but that the restart would still commence in the autumn.

"The situation is a retreat from February," Gillies told ZDNet UK. "We had aimed for the end of September, but we're now looking at somewhere in October."

In May, details emerged that the malfunction had been caused by a faulty splice between two of the busbars that carry the superconducting cable in the LHC. Gillies said that the problem had not been in the design, but in the implementation of the electrical circuits for the quench system.

"It was a quality-control flaw," said Gillies. "Most of the splices were done well, but a few of the solder joints were not perfectly carried out. We know there were a number of faulty splices in the machine. We've repaired a few, and we'll be repairing more."

Cern has developed non-invasive ways of testing the electrical circuits in some of the systems, which have remained cooled to 80 Kelvin, said Gillies. In circuits where faults have been found, Gillies said that the surrounding sectors will be warmed to room temperature, and then the circuits will be repaired and tested again.

Gillies said that Cern won't be able to give an exact restart date until August, when testing is completed. Cern has not decided whether to run the experiment at 4 TeV or at 5 TeV. The world's most powerful particle accelerator, the Tevatron at Fermilab near Chicago, runs at 1 TeV.

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